LOST JEEPS
http://www.lostjeeps.com/forum/phpBB3/

Code P0837. Need some ideas
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=8654		 Page 1 of 1
Author:  lilmatty [ Wed May 17, 2006 8:36 pm ]
Post subject:  Code P0837. Need some ideas
My 02 is throwing a 0837 code. The references say "P0837 Four Wheel Drive (4WD) Switch Circuit Range/Performance." described as "Four wheel drive (4WD) muxed switch input detected in invalid or irrational switch state (switch status provided to engine module from transfer case module during 4WD low gear engagements)"

So it is about as cryptic as Linux error messages.

Since my 4wd system seems to be working just fine I'm at a loss as to what it is that threw this code. The only problem I'm having with the KJ right now is an erroneous temp guage.

Any ideas?
Author:  valvestem [ Mon May 22, 2006 7:33 pm ]
Post subject:  Re: Code P0837. Need some ideas
lilmatty wrote:
My 02 is throwing a 0837 code. The references say "P0837 Four Wheel Drive (4WD) Switch Circuit Range/Performance." described as "Four wheel drive (4WD) muxed switch input detected in invalid or irrational switch state (switch status provided to engine module from transfer case module during 4WD low gear engagements)"

So it is about as cryptic as Linux error messages.

Since my 4wd system seems to be working just fine I'm at a loss as to what it is that threw this code. The only problem I'm having with the KJ right now is an erroneous temp guage.

Any ideas?
Image

I may be the transfer case position sensor acting up.
Author:  lilmatty [ Mon May 22, 2006 7:40 pm ]
Post subject:  Re: Code P0837. Need some ideas
valvestem wrote:
lilmatty wrote:
My 02 is throwing a 0837 code. The references say "P0837 Four Wheel Drive (4WD) Switch Circuit Range/Performance." described as "Four wheel drive (4WD) muxed switch input detected in invalid or irrational switch state (switch status provided to engine module from transfer case module during 4WD low gear engagements)"

So it is about as cryptic as Linux error messages.

Since my 4wd system seems to be working just fine I'm at a loss as to what it is that threw this code. The only problem I'm having with the KJ right now is an erroneous temp guage.

Any ideas?
Image

I may be the transfer case position sensor acting up.


Perhaps. I don't have any external indications of a problem. All 4WD operations work fine. In the description I'm not so sure what they mean by "muxed". It usually means 'multiplexed' so I'm assuming that's what it means here. But Muxed to/with what?
Author:  Se7enLC [ Mon May 22, 2006 10:36 pm ]
Post subject:  Re: Code P0837. Need some ideas
lilmatty wrote:
Perhaps. I don't have any external indications of a problem. All 4WD operations work fine. In the description I'm not so sure what they mean by "muxed". It usually means 'multiplexed' so I'm assuming that's what it means here. But Muxed to/with what?


I think you're right, it probably does mean multiplexed. But that's just a designator for the part, not the problem. It says that it is receiving an invalid state, so it either means something is wrong with the switch/sensor or something is wrong with the controller that is reading it. In either case I say have it looked at. The fact that you also have a malfunctioning temp sensor suggests a problem with the controller, but it's best to have a dealer look at it
Author:  lilmatty [ Mon May 22, 2006 11:56 pm ]
Post subject: 
My head's spinning. Saturday I replaced the temp sensor ($35 at NAPA) and now it doesn't throw that code any more. And my temp guage/overheating problem went away.
Author:  Dj S. [ Mon Sep 12, 2011 9:47 pm ]
Post subject:  Re: Code P0837. Need some ideas
So I was having problems with my engine starting. I turn the key and it has a very long turn until it starts like it isn't getting gas like it should. So I changed the fuel filter and it seemed ok that day but the next day same thing. So I read about how to find this code, and I did the key deal and got this po0837 code. Now could this be causing my starting troble or is it just another one to add to the list? :cry: It seems like as I turn the key it struggles to start but if I pump the gas it gets it up and running.
Author:  Concorde_relax [ Fri Jul 25, 2014 5:09 pm ]
Post subject:  Re: Code P0837. Need some ideas
Hi Y'all
I though I'd booty some experience.
Problem was No 4WDLo and no Part Time indications. (Other than the position
of the handle).
I cleaned the transfer case position sensor connectors with contact cleaner. No joy.
The connector had 5V (actually 5.14V).
Being an old geek, I got out some resistors & jumped with ~670 Ohms which should
correspond to 4WD Part time. No Joy.
Jumped with ~60 Ohms which should correspond to 4WD Low. No Joy.
Left it unplugged, connected generic (Acton) code reader. No code. Erased anyway.
No Joy.
Decided to try reading the codes with the odometer method. I was never able get
this to work before.
(Everything off. Ignition switch On Off On Off On within 5 seconds.)
It worked. It displayed "P0838", "P0837, "Done".
Plugged in the connector, "4WDLo" & "Part Time" light up again!!! :-).
Used generic OBDII tool to erase but ignition key still displays the codes on the odometer.
Don't want to disconnect the battery so hopefully they will eventually go away after a few cycles.

Hope this helps someone.

Good luck!
Page 1 of 1 All times are UTC - 5 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/